The China-based travel agency that organised a trip to North Korea for an American college student who died after being released in a coma from North Korean detention said it would no longer take US citizens to the country.

Young Pioneer Tours said today on its Facebook page that the death of 22-year-old Otto Warmbier shows that the risk American tourists face in visiting North Korea "has become too high."

Warmbier died in Ohio yesterday, days after being released by North Korea.

The tour operator said that it was denied any opportunity to meet with Warmbier after his detention, and that the way it was handled was "appalling."

The travel agency specializes in North Korea tours and is based in the central Chinese city of Xi'an.

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